Somehting that Locksmiths take for granted is that most locks can be keyed alike. This means that you can have one key for your whole house or business. Once completed your key ring is much smaller, easier to manage and easier to find the right key at night.
Some locks require some extra work to rekey them but on the whole it is a pretty straight forward to make your life easier.
So if you move house and would like your locks changed then don't forget to ask to have them rekeyed and keyed alike. Most of the time there is not even any extra cost. Inner West Locksmiths